94, 
GENUS ATRYPA. Sowerby. 
2621 concentrica, Conrad, Ludlow shale, fossil. 
2622 prisca, Canandaigua, N. Y., fossil. 
GENUS LEPT#ZENA. Dalman. 
2623 = alternata, Ohio, fossil. 
GENUS THECIDIUM. Defrance. 
2624 curvirostris, 
2625 Mediterranea, Def., 347 Mediterranean, Sowb. Gen., f. 6, 7. 
2626 as var., Risso. pr. M. de Nice, t.4, f. 183. 
2627 ~—s radiata, Def., fossil. 
GENUS cRANIA. Retz, Bruguiére. 
2628  antiqua, Def., Chenu C. Ill., pl. 1, f. 6. fossil. 
2629  Parisiensis, Def., Belgium, Chenu C. Il. pl. 1, f. 9. fossil. 
2630 __ personata, Lam., 298 Mediterranean, Chemn. 8, pl. 76, f. 687. 
2631  ringens, Hoening, 302 - Mediterranean, Poli, v. 2, p. 189, pl. 30. 
2632 striata, Def., Belgium, Chenu C. Ill., pl. 2, f. 1. fossil. 
GENUS oRBIcULA. Lamarck. 
2633 — lamellosa, Brod., Iquiqui, Ts. Zool. Soc.,v. 1, pl. 28, f. 2-5. 
GENUS HIPPONYX. Defrance. 
2634 acuta, Quoy, 615 New Holland, Voy. Astrol., pl. 72, f. 35, 36. 
2635 australis, Lam., 541 New Holland, Voy. Astrol., pl. 72, f. 25-34. Patella australis, Lam. 
2636 barbata, Sowb., Society Isles, Sowb. Thes., p. 369, pl. 73, f. 26. 
2637 cornucopie, Def., 614 Grignon, Blain. Mal., pl. 50, f. 1. 
2638  mitrula, Gmel., 610 Lobos Island, Zool. Proc., 1835, p. 5. Pileopsis mitrula, Lam. 
2639 vars Peru, Sowb. Thes., pl. 73, f. 18-20. Patella antiquata, Linn. 
2640 es 2 Blain. Mal., pl. 50, f. 4. Patella mitrula, Gmel. 
2641 radiata, Gray, Gallapagos, Zool. Proc., 1835, p. 5. 
